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shell: fix index out bound issue

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In order to prevent index out of bounds access of the sh->ctx->cmd_buff
array when sh->ctx->cmd_buff_pos is 0, it has been added a check for the
value of sh->ctx->cmd_buff_pos.

This ensures that the array will not be accessed beyond its boundaries.

Signed-off-by: Jungo Lin <jungolin.tw@gmail.com>
This commit is contained in:
Jungo Lin 2024-03-10 10:42:52 +08:00 • committed by Carles Cufí
commit fa716d9842
1 changed files with 2 additions and 2 deletions
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4
subsys/shell/shell.c
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@ -288,8 +288,8 @@ static bool tab_prepare(const struct shell *sh,
/* If last command is not completed (followed by space) it is treated
* as uncompleted one.
*/
int space = isspace((int)sh->ctx->cmd_buff[
sh->ctx->cmd_buff_pos - 1]);
int space = (sh->ctx->cmd_buff_pos > 0) ?
isspace((int)sh->ctx->cmd_buff[sh->ctx->cmd_buff_pos - 1]) : 0;
/* root command completion */
if ((*argc == 0) || ((space == 0) && (*argc == 1))) {